Why as Article 1 Section 6 clause 1 created?

Article 1, Section 6, Clause 1 of the U.S. Constitution was created to ensure that members of Congress could perform their legislative duties without undue interference from other branches of government. It provides them with protection from arrest during their attendance at sessions of Congress and in the course of their official duties, thus preserving the independence and integrity of the legislative process. This clause reflects the framers' intent to maintain a balance of power and protect lawmakers from potential abuses that could hinder their work.